Differentiation

Responsiveness

The body's ability to detect and respond to changes in its environment (internal or external) Example: Cells detect different sorts of changes and respond according to their function. Nerve cells detect stimuli and send nerve impulses to the brain, which sends a nerve impulse to the muscle which allows the body to move.

Reproduction

Metabolism

Sum of all chemical processes that occur in the body. An example could be the breaking down of large molecules into smaller ones, and building up of large molecules from small ones. (Proteins in food break down to amino acids, which are then used to make new, essential proteins in the body.)